Reinsurance - Guaranteed Minimum Death Benefit Contracts, Future Policy Benefits (Details) (Variable Annuity [Member], Guaranteed Minimum Death Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
Activity in future policy benefits reserves for GMDB business [Line Items]
Future Policy Benefit Reserve, beginning balance, gross	$ 1,396	$ 1,090	$ 1,170
Claims payable, beginning balance, gross	18	24	40
Less: Reinsurance and other amounts recoverable	1,317	42	53
Balance at January 1, net	97	1,072	1,157
Add: Incurred benefits	3	699	17
Less: Paid benefits	0	1,674	102
Ending balance, net	100	97	1,072
Claims payable, ending balance, gross	16	18	24
Add: Reinsurance and other amounts recoverable	1,186	1,317	42
Future Policy Benefit Reserve, ending balance, gross	1,270	1,396	1,090
Guaranteed Minimum Death Benefit Contracts Reserve Strengthening [Abstract]
Pre Tax Guaranteed Benefits Reserve Strengthening			$ 43